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/*
* Copyright (C) 2013-2017 Canonical, Ltd.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* This code is a complete clean re-write of the stress tool by
* Colin Ian King <colin.king@canonical.com> and attempts to be
* backwardly compatible with the stress tool by Amos Waterland
* <apw@rossby.metr.ou.edu> but has more stress tests and more
* functionality.
*
*/
#include "stress-ng.h"
#if defined(__linux__)
#include <sys/sysinfo.h>
#define MAX_PIDS (32)
#define _EXIT_FAILURE (0x01)
#define _EXIT_SEGV_MMAP (0x02)
#define _EXIT_SEGV_MADV_WILLNEED (0x04)
#define _EXIT_SEGV_MADV_DONTNEED (0x08)
#define _EXIT_SEGV_MEMSET (0x10)
#define _EXIT_SEGV_MUNMAP (0x20)
#define _EXIT_MASK (_EXIT_SEGV_MMAP | \
_EXIT_SEGV_MADV_WILLNEED | \
_EXIT_SEGV_MADV_DONTNEED | \
_EXIT_SEGV_MEMSET | \
_EXIT_SEGV_MUNMAP)
static volatile int segv_ret;
/*
* stress_segvhandler()
* SEGV handler
*/
static void MLOCKED stress_segvhandler(int dummy)
{
(void)dummy;
_exit(segv_ret);
}
static void __strncat(char *dst, char *src, size_t *n)
{
size_t ln = strlen(src);
if (*n <= ln)
return;
strncat(dst, src, *n);
*n -= ln;
}
/*
* stress_mmapfork()
* stress mappings + fork VM subystem
*/
int stress_mmapfork(
uint64_t *const counter,
const uint32_t instance,
const uint64_t max_ops,
const char *name)
{
pid_t pids[MAX_PIDS];
struct sysinfo info;
void *ptr;
uint64_t segv_count = 0;
int32_t instances;
int8_t segv_reasons = 0;
(void)instance;
if ((instances = stressor_instances(STRESS_MMAPFORK)) < 1)
instances = stress_get_processors_configured();
do {
size_t i, n, len;
memset(pids, 0, sizeof(pids));
for (n = 0; n < MAX_PIDS; n++) {
retry: if (!opt_do_run)
goto reap;
pids[n] = fork();
if (pids[n] < 0) {
/* Out of resources for fork, re-do, ugh */
if (errno == EAGAIN) {
(void)shim_usleep(10000);
goto retry;
}
break;
}
if (pids[n] == 0) {
/* Child */
(void)setpgid(0, pgrp);
stress_parent_died_alarm();
if (stress_sighandler(name, SIGSEGV, stress_segvhandler, NULL) < 0)
_exit(_EXIT_FAILURE);
if (sysinfo(&info) < 0) {
pr_fail_err(name, "sysinfo");
_exit(_EXIT_FAILURE);
}
len = ((size_t)info.freeram / (instances * MAX_PIDS)) / 2;
segv_ret = _EXIT_SEGV_MMAP;
ptr = mmap(NULL, len, PROT_READ | PROT_WRITE,
MAP_POPULATE | MAP_SHARED | MAP_ANONYMOUS, -1, 0);
if (ptr != MAP_FAILED) {
segv_ret = _EXIT_SEGV_MADV_WILLNEED;
madvise(ptr, len, MADV_WILLNEED);
segv_ret = _EXIT_SEGV_MEMSET;
memset(ptr, 0, len);
segv_ret = _EXIT_SEGV_MADV_DONTNEED;
madvise(ptr, len, MADV_DONTNEED);
segv_ret = _EXIT_SEGV_MUNMAP;
munmap(ptr, len);
}
_exit(EXIT_SUCCESS);
}
(void)setpgid(pids[n], pgrp);
}
reap:
for (i = 0; i < n; i++) {
int status;
if (waitpid(pids[i], &status, 0) < 0) {
if (errno != EINTR) {
pr_err(stderr, "%s: waitpid errno=%d (%s)\n",
name, errno, strerror(errno));
}
} else {
if (WIFEXITED(status)) {
int masked = WEXITSTATUS(status) & _EXIT_MASK;
if (masked) {
segv_count++;
segv_reasons |= masked;
}
}
}
}
(*counter)++;
} while (opt_do_run && (!max_ops || *counter < max_ops));
if (segv_count) {
char buffer[1024];
size_t n = sizeof(buffer) - 1;
*buffer = '\0';
if (segv_reasons & _EXIT_SEGV_MMAP)
__strncat(buffer, " mmap", &n);
if (segv_reasons & _EXIT_SEGV_MADV_WILLNEED)
__strncat(buffer, " madvise-WILLNEED", &n);
if (segv_reasons & _EXIT_SEGV_MADV_DONTNEED)
__strncat(buffer, " madvise-DONTNEED", &n);
if (segv_reasons & _EXIT_SEGV_MEMSET)
__strncat(buffer, " memset", &n);
if (segv_reasons & _EXIT_SEGV_MUNMAP)
__strncat(buffer, " munmap", &n);
pr_dbg(stderr, "%s: SIGSEGV errors: %" PRIu64 " (where:%s)\n",
name, segv_count, buffer);
}
return EXIT_SUCCESS;
}
#else
int stress_mmapfork(
uint64_t *const counter,
const uint32_t instance,
const uint64_t max_ops,
const char *name)
{
return stress_not_implemented(counter, instance, max_ops, name);
}
#endif
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